Introduction

si4ti is a LGPL licensed seismic inversion tool for monitoring effects in 4D seismic from changes in acoustic properties of a reservoir.

Timeshift

si4ti timeshift computes the dynamic timeshift between traces of different datasets (vintages). It uses vertical and horizontal smoothing constraints, and no prior information.

Impedance

si4ti impedance uses a statistical wavelet and lateral, horizontal and 4D smoothing for computing the relative acoustic impedance of a set of vintages.

Installation

Pre-built executables for Linux can be downloaded from here.

Build from source

To build si4ti you need:

• A C++11 compatible compiler (tested on gcc)
• CMake version 3.5 or greater
• Eigen3 version 3.3.4 or greater
• OpenMP
• segyio run cmake with EXPERIMENTAL=ON to get the required C++ headers
• fftw

To build the documentation you also need:

• sphinx

To build and install si4ti run the following commands in your console:

git clone https://github.com/equinor/si4ti
mkdir si4ti/build
cd si4ti/build
cmake .. -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=ON
make
make install

To build the documentation run:

cmake .. -DBUILD_DOC=TRUE
make doc

Usage

For more information on how to run the programs:

timeshift --help
impedance --help
apply-timeshift --help